To get the type of a variable you need to use the typeof type operator: const MY_CONSTANT = ‘MY_CONSTANT’ // must be const, no annotation. let or var will not work const SOMETHING_ELSE = ‘SOMETHING_ELSE’ // must be const, no annotation. let or var will not work type MyType = typeof MY_CONSTANT | typeof SOMETHING_ELSE … Read more
Are the \x/\u/\U character references freely combinable with all string types? No. \x can be used in anything, but \u and \U can only be used in strings that are specifically UTF-encoded. However, for any UTF-encoded string, \u and \U can be used as you see fit. Are all the string types fixed-width, i.e. the … Read more
This is not undefined behavior, but unspecified behavior. For string literals, The compiler is allowed, but not required, to combine storage for equal or overlapping string literals. That means that identical string literals may or may not compare equal when compared by pointer. That means the result of A == B might be true or … Read more
Constant expressions are not guaranteed to be evaluated at compile time, we only have a non-normative quote from draft C++ standard section 5.19 Constant expressions that says this though: […]>[ Note: Constant expressions can be evaluated during translation.—end note ] You can assign the result to constexpr variable to be sure it is evaluated at … Read more
Use the preprocessor # operator: #define CALL_DO_SOMETHING(VAR) do_something(#VAR, VAR);
I can’t find what it does It has to do with string literals and raw strings. I think it is explained pretty well in this part of the documentation, in the code block that is posted there you can see what it does: “foo”; r”foo”; // foo “\”foo\””; r#””foo””#; // “foo” “foo #\”# bar”; r##”foo … Read more
A common technique is for string literals to be put in “read-only-data” section which gets mapped into the process space as read-only (which is why you can’t change it). It does vary by platform. For example, simpler chip architectures may not support read-only memory segments so the data segment will be writable. Rather than try … Read more
You are not putting a ” before the end of the line. Use “”” if you want to do this: “”” a very long string …… ….that can span multiple lines “””
you can use always: ‘C:/mydir’ this works both in linux and windows. Other posibility is ‘C:\\mydir’ if you have problems with some names you can also try raw string literals: r’C:\mydir’ however best practice is to use the os.path module functions that always select the correct configuration for your OS: os.path.join(mydir, myfile) From python 3.4 … Read more
In C and in C++ single quotes identify a single character, while double quotes create a string literal. ‘a’ is a single a character literal, while “a” is a string literal containing an ‘a’ and a null terminator (that is a 2 char array). In C++ the type of a character literal is char, but … Read more